Access Keys:
Skip to content (Access Key - 0)
Biology 110 - Basic Concepts and Biodiversity

Contents

Toggle Sidebar
Mendel and Modern Genetics

Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Section
bordertrue
Column
width60%

Figure 5 illustrates the relationship between genotypes and phenotypes, with flower color used as an example. An organism's genotype is its genetic makeup for a particular trait; that is, the alleles it has for a particular gene. The phenotype is the organism's appearance; that is, the trait produced by the alleles the individual has.. How does the genotype for a trait lead to the phenotype? The different alleles at a gene differ in their DNA sequences, thereby producing different enzymes when transcribed into RNA and translated into a protein. These enzymes can have different levels of activity; therefore, the organism's phenotype will differ depending on the enzymes present. The manner in which gene products interact to determine the phenotype is usually complex. The example provided below should help to clarify the relationship between genotype and phenotype.

Transcript for Mendel - Part I

Column
width40%


Figure 5. Genotype versus phenotype. (Click image to enlarge)

...

Section
Column
width70%

Traits with simple dominant/recessive expression patterns, where one trait is completely dominant over another, such as those we have discussed so far, are called Mendelian traits. Mendelian traits are found in humans, and include non-disease examples such as attached versus unattached earlobes, mid-digital hair, bent thumbs, and a few other traits. These traits are useful for understanding the basic principles of genetics, but as you will learn in upcoming tutorials, very few traits are actually inherited in this simple manner. 

Column
width30%
 
Section
Column
width70%

 

 

Transcript for Mendel - Part II

Transcript for Mendel - Part III

Column
width30%
 

A Real Life Example of Mendelian Genetics

...

Section
bordertrue
Column
width80%

Questions?  Either send Send your instructor a message through ANGEL or attend an office hour (the times and places are posted on ANGEL).Canvas!

Column
width20%